Crusher roll



B. c. OS LER.

CRUSHER ROLL. APPLICATION FILED'JUNE 14, I921.

Patented May 9,1922.

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CRUSH ER mm.

APPLICATION FILED JUNE 14, 1921.

1,415,608. Patented my 9,1922.

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CRUSHER ROLL.

To all whom it may concern:

Be it known that I, BOYD C. Osman, a citizen of the United States, resident of Hazleton, Pennsylvania, have invented certain new and useful Improvements 'in Crusher Rolls, of which the following is a specifi-' catio My invention aims to provide an improved type of rolls suitable for crushing coal and various other materials and having advanof the segments in longitudinal section, un-

derside plan and cross-sectionrespectively, and Fig. 7 is an inside elevation of part of one of the roller heads.

Referring to the embodiment of the in- .vention illustrated the rolls A are provided with projections B which in practice are of various designs and are arranged to crush the coal and other material between them, being driven by gearing as indicated. For some classes of work the rolls may be smooth and in other cases they are provided with projections of various designs depending on the character of the work to be done. They are also of various sizes for crushing the product to successively finer sizes.

My invention provides for the construction of such rolls in a way to permit the making of the wearing surface of manganese steel or other special material without undue expense, and to hold the parts together firmly against the shocks and strains occasioned by their use. For this purpose the wearing part of the roll is made in segments and these segments are bolted on the heads or equivalent supporting means, and are also interlocked with the support against lateral and tangential strains.

In the preferred form illustrated, each roll is made up of heads C with hubs keyed on the driving shafts and segments D mounted on said heads. Each head is provided with inner and outer flanges E and F, the

former beingprovided with radial slots Gr,

Fig. 7 the sides of which are machined Specification of Letters Patent. Pate t d May 9, 1922. Application filed June 14, 1921. Serial No. 477,399.

or otherwise accurately, finished; Each seg- Beyond the directly on the peripheries of the "heads and i which are provided with bolt holes L overlying bolt holes in the outer flan es, of the.

heads through which pass bolts with jam nuts N for fastening the segments radially to the heads; l j

The side edges of each vided with :slight bosses, faces to make a ment.

Between the projection K, Fig. 4, on the segment are progoodfit against the next segend of each segment and the key orlug J.

there is a slot P or recess which permits the grlnding of the inner face Q of the end of the segment; and of the end face R of the lug without a fillet at the point where these two places meet, so that the segment may fit down close upon the head of the roll and the end face R fit closely against'the end of the .slot inthe head.

These-lugs J enter the slots in the head to a depth great enough to hold'the segments in place even if the holding bolts should be loosened a little.- The chief function of this interlocking engagement of the segments with the heads is to prevent relative lateral and tangential movement caused by strains resulting from the crushing of material and corresponding working of the bolts, which would tend to'loosen them. With the close fitting interlocking arrangement described, the bolts are subjected to radial strains only, and these' strains are comparatively slight because the use of the rolls pressesthe segments always against the heads. a

The interlockingengagementmay be secured in a'variety of ways, as'by a key on the head entering a slot'in the segment, or a separate key entering slots in the head and segment; and such separate keys might; have their ends threaded to receive the fastening nuts in lieu of the bolts illustrated. Also the interlocking parts may be provided in any desired number across the wjdth of each segment and may be on the outside flange or other part of the roll head instead of on the inside flange as illustrated, and the bosses or keys may be of various other shapes than that shown. Also it is not es sential that each segment be interlocked with heads. Such an interlocking arrangement applied to one or more of the segments will eliminate or reduce the lateral and tangential strains on the bolts.

A roll. body thus constructed has great mechanical strength and distributes the stresses arising in use throughout the body of the roll and reduces torsional strains on the shafting as compared with rolls in which there is no such even distribution of the strains. The heads provide ample bearing for the support of the segments with unlimited room for longitudinal reinforcing ribs on their innerfaces, and with a comparatively short span between the inner flanges of the heads and an ample cross-section of metal in the heads near their periphery. Shearing strains on the bolts are practically eliminated. The segments, assuming each of these to be made according to the same design, are interchangeable and are automatically aligned in assembling the roll and held in alignment during use. The construction is also cheaper than that of previous rolls using a cast iron support and wearing segments of special steel having a high resistance to abrasion.

Though I have described with great particularity of detail certain embodiments of my invention, yet it is not to be understood therefrom that the invention is restricted to the embodiments illustrated. Various modifications thereof in detail and in the arrangement of the parts may be made by those skilled in the art without departure from the invention as defined in the following claims.

What I claim is:

1. A crusher roll comprising separate heads and peripheral segments carrying crushing projections on their outer faces, said segments engaging each other at their side edges and being bolted to the separate heads and additional means on said sup porting heads adapted for interlocking engagement with the segments for holding said segments against peripheral movement,

and relieving the bolts of strain in the peripheral direction.

2. A crusher roll comprising at least a pair of separate heads each with an outer and an inner flange and peripheral segments bolted to one of the flanges of each head, and additional interlocking means cooperating with the other flange of each head to prevent relative peripheral movement, and to relieve the bolts of strain in the peripheral direction.

3. A crusher roll comprising at least a pair of separate heads each with an outer and an inner flange and peripheral segments each bolted to one of the flanges on'each head and having keys fitting in slots in the other flanges of the heads.

4. A crusher roll comprising at least a pair of separate heads of cast iron and peripheral segments of high grade steel carrying integral crushing projections on their outer faces, said segments engaging each other at their slde edges and being fastenedon said heads and keyed thereto, so as to relieve the fastenings of strain in the peripheral direction.

In witness whereof I have hereunto signed my name.

BOYD O. OSLER. 

